KeyframeEffect and KeyframeEffectReadOnly constructors can run in the caller
compartment, which is okay because the current compartment is used in the
following places and all of them are safe:
1. GlobalObject::CallerType(), that is ultimately passed to
nsDocument::IsWebAnimationsEnabled in KeyframeEffectParamsFromUnion,
to decide whether to copy mIterationComposite/mComposite to
KeyframeEffectParams.
GlobalObject::CallerType() can now be different than the target window's one,
if the caller has the system principal and the target is web content, and
in that case nsDocument::IsWebAnimationsEnabled there always returns true
while Web Animations can be disabled on web content.
honoring the mIterationComposite/mComposite properties is OK, since it just
changes the animation behavior, and this is disabled by default until
remaining spec issues are resolved.
2. GlobalObject::Context(), that is ultimately passed to
KeyframeUtils::GetKeyframesFromObject and used while extracting information
from passed-in keyframe object, with iterable/iterator protocols.
Performing that operation in the caller side is okay, since the same thing
can be done on caller, and the operation doesn't perform any GCThing
allocation on the target window global.
KeyframeEffect and KeyframeEffectReadOnly constructors can run in the caller
compartment, which is okay because of the following reasons:
1. The target window global is used for most operation:
* KeyframeEffectReadOnly::ConstructKeyframeEffect uses the target window
global instead of current global.
* KeyframeEffectParamsFromUnion which receives `aGlobal.CallerType()`
In Xray case, Web Animations API can be disabled on web content
(currently disabled on beta/release by default), and in that case some API
won't work even it's triggered from WebExtensions, but it should be fine.
2. GetKeyframesFromObject is executed in the caller's compartment to access
the passed-in JSObject that is keyframe, with iterable/iterator protocols.
This operation doesn't perform any GCThing allocation on the target window
global.
The difference between nsDocument::IsWebAnimationsEnabled and
nsContentUtils::AnimationsAPICoreEnabled is that the former checks the caller
type and treats the preference as set for system callers which is particularly
needed for enabling things like the getProperties() API for DevTools etc.
Generally in API-facing call sites we have a JS context / CallerType and so we
want to distinguish between system callers and non-system callers. However, for
a few internal uses--specifically filling-in missing keyframes--we don't care
about the caller type and always follow the pref setting.
That may or not be quite what we want, but this patch doesn't change that except
for one call site: KeyframeUtils::GetKeyframesFromObject. This patch changes
GetKeyframesFromObject from *not* checking the caller type to checking the
caller type. That seems to be the correct behavior here since this is called
from KeyframeEffectReadOnly::SetKeyframes(JSContext*, JS::Handle<JSObject*>,
ErrorResult&) (i.e. a JS API-facing call site) where we *should* enable the full
API when the caller is chrome code.
MozReview-Commit-ID: FQJBk3zytwd
This is a large patch which tries to switch many of the external consumers of
nsGlobalWindow to instead use the new Inner or Outer variants.
MozReview-Commit-ID: 99648Lm46T5
(Path is actually r=froydnj.)
Bug 1400459 devirtualized nsIAtom so that it is no longer a subclass of
nsISupports. This means that nsAtom is now a better name for it than nsIAtom.
MozReview-Commit-ID: 91U22X2NydP
To check simulateComputeValuesFailure flag in chrome privilege, we will need
to know the core Web Animations API preference is enabled in chrome privilege.
MozReview-Commit-ID: GYRMc9Od4Bm
Adds a utility function for getting the document on the global associated with
a JSContext. We will need this in various situations where we want to use
the CSS parser (which requires various bits of state we pull off a document)
to parse a timing function but might not have a target element.
Strictly speaking we currently always have a target element but in future we
expect to support creating KeyframeEffects without an associated target
element. Also, we will need this for some situations in bug 1245748 where we
need to parse CSS properties on keyframe objects when we may not have a
target element.
MozReview-Commit-ID: Klku1LFoRGp
This patch also moves AnimationUtils out of the dom namespace since it seems
unnecessary. We typically only put actual DOM interfaces in the dom namespace.
